Signal Integrator Circuit

The signal integrator circuit takes the total net charge of a particle collision and compresses it into one single digital pulse that  represent the total
charge of the collision.  The circuit below is a schematic of the integrator that we used.  The op amp suggested is either a LF411 or an LM741,
we used the LM741.  The resistor is a 10Kohm and the capacitor is a 0.1micro farad. I would also suggest placing a resistor across the cap to
discharge ti between uses.